For cloud hosting, Hetzner is a solid one. Much cheaper than getting involved in AWS, which I’d recommend to stay away from. AWS, and Azure too, can perform their magic trick of generating plenty of unexpected costs, or raising their pricing on the run.
As for the software, Discourse works good as a modern forum. Just spin up a Hetzner cloud machine for about 5 EUR monthly, and setup the preferred software.
I made the switch to Lemmy today, feels old school kind of good.
Reddit is not only allowing for bots to run rampant, but also it’s managed by the Epstein class and their supporters.